Even-balance pump-jack.



W. L. DAYTON.

EVEN BALANCE PUMP JACK.

APPLICATION FILED SEPT-14,19?-

Patented Feb. 4, 1919;

2 SHEETSSHEET I.

W. L. DAYTON.

EVEN BALANCE PUMP JACK.

APPLICATION FILED SEPT-14.1%?

Patented Feb. 4, 1919.

2 SHEETSSHEET 2.

IN VEN TOR.

ATTRNEY WILLIAM L. DAYTON, OF FORT WORTH, TEXAS.

EVEN-BALANCE PUMP-JACK.

iaeaeoe.

Specification of Letters Patent.

Patented Feb. 4t, 1919.

Application filed September 14:, 1917. Serial No. 191,410.

To all whom it may concern:

Be it known that I, WILLIAM L. DAYTON, a citizen of the United States of America, residing at Fort Worth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Even-Balance Pump-Jacks, of which the following is a specification.

My invention relates to pump jacks and more particularly to meansfor increasing the power of the pump jacks, and the object is to provide simple devices for aiding the power mechanism, including ashifting weight which will balance the sucker rod during the down stroke and then be shifted to a different position for balancing the load on the upstroke and the advantage of the improvement is that it will cause uniformity in the working parts both on the upstroke and the down stroke. Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this applica tion.

Figure 1 is a side elevation of the pump jack. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation of a variation in the pump jack. Fig-4 is a plan view of the jack shown in Fig. 3.

Similar characters of reference are used to indicate the same parts throughout the several views.

The improved pump jack has a frame tudinal beams 1 and 2 and an upright extension 3, and a side member 4 having the same dimensions as the member 3, and a side member 5 having beams similar to beams 1 and 2 and the upright 6. The side members 3 and 5 are connected to the central member by sleeved bolts 7. The side member 5 is further connected to the central member by shafts hereinafter described.

A power shaft 8 is ournaled in the central member and in the side member 5 and a power pulley 9 is mounted rigidly on said shaft. The power shaft 8 is provided with a balance wheel 10 and a pinion 11 rigid therewith. The pinion 11 drives a cog wheel 12 which is rigid with the shaft 13 which is journaled in the central member and in the side member 5. The cog wheel 12 drives a cog wheel 14 which is rigid with a shaft 15 which is journaled in the central frame member and in member 5. The shafts 8, 13 and 15 form connecting means for the cen tral frame member and member 5.

A walking beam 28 is fulcrumed in the frame members 3 and 4 and a bell crank lever 29 is fulcrumed in the working end of the beam 28 and this lever carries a sucker rod connection 19. An upstanding fulcrum 30 is rigidly attached to the beam 28 and a lever having arms 31, 32, and 33 is pivotally mounted in said fulcrum. The beam 28 is actuated by the arm 33 which is pivotally connected to a link bar or pitman 20 and the pitman 20 is pivotally connected to a crank 26 which is rigid with the shaft 15. The shaft 8 drives pinion 11 and pinion 11 drives cog wheel 12 which is rigid with shaft 13 and cog wheel 12 drives cog wheel 14 which drives shaft 15. The beam 28 is also actuated by a crank 34 which is rigid with shaft 13. A pitman rod 35 is pivoted to the crank 34: and pivotally connected to the beam 28 by a moving pivot 36. The beam 28 has a slot 37 therein and the pivot bolt 36 slides in said slot and the pivot bolt may be provided with a roller bearing to make friction less. The

pitman 35 is extended above the beam 28 and a counter-weight 38 is attached thereto. The pivot bolt 36 is moved in the slot 37 by a link bar 39 which is pivotally connected to the pivot bolt and to the arm 31. A link bar 40 is pivotally connected to the arm 32 of the three armed lever and to the bell crank lever 29. The pitman rod or bar 35 is more than a pitman because it carries a counter balancing weight 38. This pitman actuates the beam 28 directly by means of the crank 34 which is driven by shaft 13. The force of the load or water being raised is utilized to shift weight 38 because the load will rock the bell crank lever 29 and this lever will operate the three-arm lever through the link bar. When the work end of the lever is going down, the weight 38 will be drawn toward the fulcrum 17 by the bell-crank lever 29, the link bar l0, arms 32 and 31 of the three arm lever, and link bar 39. At the same time, the crank 26, pitman 20, and lever arm 33 are cooperating to shift the weight toward the fulcrum 17 so that the beam 28 may rock more easily on the down stroke. The weight 38 is thus automatically shifted toward the center or fulcrum 17. On the upstroke, the pitman 35 is pulling down on the beam 28. At the same time, the weight of water will pull on the till bell-crank .lever 29, and this lever through link bar will pull on the three arm lever and through arms 32 and 31 will push on link bar 39 to throw the weight 38 away from the fulcrum 17 toward the outer end of the beam 28 where the weight performs the function of pulling down 011 the lever or beam 28 to assist in raising the load. The weight 38 is thus automatically moved away from the center of the fulcrum toward the end of the walking beam. At the same time, the crank 26 is pushing on the link bar 20 and this bar is pushing on the lever arm 33 by means of power from the driving gear, thus cooperating with the load which is pulling on the lever 29. The load thus forms or furnishes a part of the power to lift itself.

The variation shown in Figs. 3 and 4 includes a walking beam 16 which is fulcrumed in the members 3 and 4 on the rocker shaft or bolt 17. The beam 16 is provided with a brace 18. A connecting rod 19 is )ivotally connected to the beam 16 and the cam 16 is actuated by a pitman rod 20 and a crank 21, the latter bein rigid with the shaft 13. A depending bracket 22 is rigidly connected to the walking beam 16. A sliding guide bar 23 reciprocates through said bracket at right angles thereto and a weight 24 is carried by the bar 23. This weight may be made in sections so that one or more sections may be removed or more sections added to increase the power. F our anti-friction rollers 25 are journaled in the lower part of the bracket 22. The guide arm 23 is approximately parallel to the walking beam 16 and thisrelation of the two elements, beam 16 and guide arm 23, remain the same in whatever position they may assume. The weight 2 L is shifted toward and from the fulcrum 17 or toward and from a line representing the center of gravity running through the fulcrum 17 by means of a crank 26 which is rigid with shaft 15 and by a link bar 27 which is pivotally connected to the crank 26 and to guide arm 23.

What I claim is:-

1. A. pump jack comprising a frame, a walking beam fulcrumed on said frame, a power wheel operatively connected to said walking beam for actuating said. beam, a weight slidable on the power end of said beam, and means on the work end of said beam operatively connected to said weight for automatically thrusting said weight toward the power end of the beam on the upstroke of the work end.

2. pump jack comprising a frame, a walking beam fulcrumed on said frame, means for actuating said beam, a weight slidable on the power end of said beam, and means on the work end of said beam operatively connected to said weight for automatically thrusting said weight from the.

fulcrum of said beam on the upstroke of the work end of said beam.

3. A pump jack comprising a frame, a walking beam fulcrumed on. said frame, means for actuatin said beam, a weight shiftable on the power end of said beam, and means on the work end of said beam operatively connected with said weight for automatically drawing said weight toward the fulcrum of said beam on the down stroke of the work end and for automatically thrusting said Weight away from said fulcrum on the upstroke of the work end of said beam.

4. A pump jack comprising a frame, a walking beam fulcrumed on said frame, a gear actuating means for said beam, 2. weight slidable on the power end of said beam and means on the work end of said beam operatively connected with said weight for automatically drawing said weight toward the fulcrum of said beam on the down stroke of the work end and for automatically thrusting said weight away from said fulcrum on the upstroke of the work end for cooperating with said gear actuating means.

5. A pump jack comprising a frame, a walking beam fulcrumed on said frame, a gear actuating means for said beam, a weight slidable on the power end of said beam, a bell crank lever on the work end of said beam, a three arm lever on the power end of said beam, a link bar connected to said bell crank lever and to one of the arms of said three arm lever, means connecting one of said arms to said weight and means connecting the other arm to said gear actuating means, and means connecting said weight to said gear actuating means.

In testimony whereofI set my hand this tenth day of September, 1917 WILLIAM L. DAYTON. 

